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• W4362541569 abstract "We report an infrared ellipsometry study of the charge carrier dynamics in polycrystalline ${mathrm{K}}_{x}p$-terphenyl samples with nominal $x=3$, for which signatures of high-temperature superconductivity were previously reported. The infrared spectra are dominated by two Lorentzian bands with maxima around 4000 and $12 000 {mathrm{cm}}^{ensuremath{-}1}$ which, from a comparison with calculations based on a Huckel model, are assigned to intramolecular excitations of $ensuremath{pi}$ electrons of the anionic $p$-terphenyl molecules. The intermolecular electronic excitations are much weaker and give rise to a Drude peak and a similarly weak Lorentzian band around $220 {mathrm{cm}}^{ensuremath{-}1}$. A dc resistivity of about $0.3 mathrm{ensuremath{Omega}}phantom{rule{0.16em}{0ex}}mathrm{cm}$ at $300phantom{rule{0.28em}{0ex}}mathrm{K}$ is deduced from the IR data, comparable to values measured by electrical resistivity on a twin sample. The analysis of the temperature dependence of the low-frequency response reveals a gradual decrease of the plasma frequency and the scattering rate of the Drude peak below $300phantom{rule{0.28em}{0ex}}mathrm{K}$ that gets anomalously enhanced below $90phantom{rule{0.28em}{0ex}}mathrm{K}$. The corresponding missing spectral weight of the Drude peak appears blueshifted towards the Lorentz band at $220 {mathrm{cm}}^{ensuremath{-}1}$. This characteristic blueshift signifies an enhanced localization of the charge carriers at low temperatures and contrasts the behavior expected for a bulk superconducting state for which the missing spectral weight would be redshifted to a delta function at zero frequency that accounts for the loss-free response of the superconducting condensate. Our data might still be compatible with a filamentary superconducting state with a volume fraction well below the percolation limit for which the spatial confinement of the condensate can result in a plasmonic resonance at finite frequency." @default.
• W4362541569 created "2023-04-06" @default.
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• W4362541569 date "2023-03-31" @default.
• W4362541569 modified "2023-10-01" @default.
• W4362541569 title "Infrared ellipsometry study of the charge dynamics in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi mathvariant=normal>K</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>p</mml:mi></mml:mrow></mml:math> -terphenyl" @default.
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• W4362541569 doi "https://doi.org/10.1103/physrevb.107.094520" @default.
• W4362541569 hasPublicationYear "2023" @default.
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